var findWidths = function(start, end, numOfCols, gutterWidth) {
  var reminder,
      widths = [];
  for (var i = start; i <= end; i++) {
    reminder = (i - (gutterWidth * (numOfCols - 1))) % numOfCols
    if (reminder === 0) {
      widths.push(i);
    }
  }
  return widths;
};

var calColWidth = function(width, gutterWidth, numOfCols) {
  return (width - ((numOfCols - 1) * gutterWidth))/numOfCols;
};

